You are here: Home :: Area NEM :: Chemistry :: Physical chemistry

B. G. Ershov, M. Kelm, E. Janata, A. V. Gordeev, E. Bohnert

Radiation-chemical effects in the near-field of a final disposal site: role of bromine on the radiolytic processes in NaCl-solutions

The oxidation of Br^- by Cl₂^- is investigated by gamma pulse radiolysis in aqueous solutions of NaCl and NaBr. Depending on the ratio of the concentration of Br^- to Cl^-, the main product being observed is either Cl₂^-, ClBr^- or Br₂^-. The mixed radical anion ClBr^- exhibits a broad absorption band at 350 nm with ε₃₅₀=9300 dm³ mol^-1 cm^-1. The rate constants of the equilibrium Cl₂^- + Br^-↔ ClBr^-+Cl^- are determined to be k_f=4×10⁹ dm³ mol^-1 s^-1 and k_b=1.1×10² dm³ mol^-1 s^-1. The formation of the Cl₃^- (λ_max=220 nm), Cl₂Br^- (λ_max=230 nm) and ClBr₂^- (λ_max=245 nm) ions in the radiation-chemical oxidation of Cl^- and Br^- ions in an aqueous solution was observed by pulse radiolysis, and its mechanisms of appearance and the equilibrium constants were determined.

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 90, 09/2002
Pages: 617

Journal homepage (external site)

Show all available items of this journal

 

Area NEM